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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
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# pylint: disable=C,R,W
from superset.db_engine_specs.base import LimitMethod
from superset.db_engine_specs.postgres import PostgresBaseEngineSpec


class OracleEngineSpec(PostgresBaseEngineSpec):
    engine = 'oracle'
    limit_method = LimitMethod.WRAP_SQL
    force_column_alias_quotes = True
    max_column_name_length = 30

    time_grain_functions = {
        None: '{col}',
        'PT1S': 'CAST({col} as DATE)',
        'PT1M': "TRUNC(CAST({col} as DATE), 'MI')",
        'PT1H': "TRUNC(CAST({col} as DATE), 'HH')",
        'P1D': "TRUNC(CAST({col} as DATE), 'DDD')",
        'P1W': "TRUNC(CAST({col} as DATE), 'WW')",
        'P1M': "TRUNC(CAST({col} as DATE), 'MONTH')",
        'P0.25Y': "TRUNC(CAST({col} as DATE), 'Q')",
        'P1Y': "TRUNC(CAST({col} as DATE), 'YEAR')",
    }

    @classmethod
    def convert_dttm(cls, target_type, dttm):
        return (
            """TO_TIMESTAMP('{}', 'YYYY-MM-DD"T"HH24:MI:SS.ff6')"""
        ).format(dttm.isoformat())
